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Annotation of Net2/dev/cons.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1991 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)cons.c      7.2 (Berkeley) 5/9/91
        !            39:  *
        !            40:  * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
        !            41:  * --------------------         -----   ----------------------
        !            42:  * CURRENT PATCH LEVEL:         1       00083
        !            43:  * --------------------         -----   ----------------------
        !            44:  *
        !            45:  * 16 Aug 92   Pace Willisson          /dev/console redirect (xterm -C, etc.)
        !            46:  * 14 Mar 93   Chris G. Demetriou      Moved pg() here from isa/pccons.c
        !            47:  */
        !            48: 
        !            49: 
        !            50: #include "sys/param.h"
        !            51: #include "sys/proc.h"
        !            52: #include "sys/user.h"
        !            53: #include "sys/systm.h"
        !            54: #include "sys/buf.h"
        !            55: #include "sys/ioctl.h"
        !            56: #include "sys/tty.h"
        !            57: #include "sys/file.h"
        !            58: #include "sys/conf.h"
        !            59: 
        !            60: #include "cons.h"
        !            61: 
        !            62: /* XXX - all this could be autoconfig()ed */
        !            63: int pccnprobe(), pccninit(), pccngetc(), pccnputc();
        !            64: #include "com.h"
        !            65: #if NCOM > 0
        !            66: int comcnprobe(), comcninit(), comcngetc(), comcnputc();
        !            67: #endif
        !            68: 
        !            69: struct consdev constab[] = {
        !            70:        { pccnprobe,    pccninit,       pccngetc,       pccnputc },
        !            71: #if NCOM > 0
        !            72:        { comcnprobe,   comcninit,      comcngetc,      comcnputc },
        !            73: #endif
        !            74:        { 0 },
        !            75: };
        !            76: /* end XXX */
        !            77: 
        !            78: struct tty *constty = 0;       /* virtual console output device */
        !            79: struct consdev *cn_tab;        /* physical console device info */
        !            80: struct tty *cn_tty;            /* XXX: console tty struct for tprintf */
        !            81: 
        !            82: cninit()
        !            83: {
        !            84:        register struct consdev *cp;
        !            85: 
        !            86:        /*
        !            87:         * Collect information about all possible consoles
        !            88:         * and find the one with highest priority
        !            89:         */
        !            90:        for (cp = constab; cp->cn_probe; cp++) {
        !            91:                (*cp->cn_probe)(cp);
        !            92:                if (cp->cn_pri > CN_DEAD &&
        !            93:                    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
        !            94:                        cn_tab = cp;
        !            95:        }
        !            96:        /*
        !            97:         * No console, we can handle it
        !            98:         */
        !            99:        if ((cp = cn_tab) == NULL)
        !           100:                return;
        !           101:        /*
        !           102:         * Turn on console
        !           103:         */
        !           104:        cn_tty = cp->cn_tp;
        !           105:        (*cp->cn_init)(cp);
        !           106: }
        !           107: 
        !           108: cnopen(dev, flag, mode, p)
        !           109:        dev_t dev;
        !           110:        int flag, mode;
        !           111:        struct proc *p;
        !           112: {
        !           113:        if (cn_tab == NULL)
        !           114:                return (0);
        !           115:        dev = cn_tab->cn_dev;
        !           116:        return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p));
        !           117: }
        !           118:  
        !           119: cnclose(dev, flag, mode, p)
        !           120:        dev_t dev;
        !           121:        int flag, mode;
        !           122:        struct proc *p;
        !           123: {
        !           124:        if (cn_tab == NULL)
        !           125:                return (0);
        !           126:        dev = cn_tab->cn_dev;
        !           127:        return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p));
        !           128: }
        !           129:  
        !           130: cnread(dev, uio, flag)
        !           131:        dev_t dev;
        !           132:        struct uio *uio;
        !           133: {
        !           134:        if (cn_tab == NULL)
        !           135:                return (0);
        !           136:        dev = cn_tab->cn_dev;
        !           137:        return ((*cdevsw[major(dev)].d_read)(dev, uio, flag));
        !           138: }
        !           139:  
        !           140: cnwrite(dev, uio, flag)
        !           141:        dev_t dev;
        !           142:        struct uio *uio;
        !           143: {
        !           144:        if (cn_tab == NULL)
        !           145:                return (0);
        !           146:        if (constty)                                    /* 16 Aug 92*/
        !           147:                dev = constty->t_dev;
        !           148:        else
        !           149:                dev = cn_tab->cn_dev;
        !           150:        return ((*cdevsw[major(dev)].d_write)(dev, uio, flag));
        !           151: }
        !           152:  
        !           153: cnioctl(dev, cmd, data, flag, p)
        !           154:        dev_t dev;
        !           155:        caddr_t data;
        !           156:        struct proc *p;
        !           157: {
        !           158:        int error;
        !           159: 
        !           160:        if (cn_tab == NULL)
        !           161:                return (0);
        !           162:        /*
        !           163:         * Superuser can always use this to wrest control of console
        !           164:         * output from the "virtual" console.
        !           165:         */
        !           166:        if (cmd == TIOCCONS && constty) {
        !           167:                error = suser(p->p_ucred, (u_short *) NULL);
        !           168:                if (error)
        !           169:                        return (error);
        !           170:                constty = NULL;
        !           171:                return (0);
        !           172:        }
        !           173:        dev = cn_tab->cn_dev;
        !           174:        return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p));
        !           175: }
        !           176: 
        !           177: /*ARGSUSED*/
        !           178: cnselect(dev, rw, p)
        !           179:        dev_t dev;
        !           180:        int rw;
        !           181:        struct proc *p;
        !           182: {
        !           183:        if (cn_tab == NULL)
        !           184:                return (1);
        !           185:        return (ttselect(cn_tab->cn_dev, rw, p));
        !           186: }
        !           187: 
        !           188: cngetc()
        !           189: {
        !           190:        if (cn_tab == NULL)
        !           191:                return (0);
        !           192:        return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
        !           193: }
        !           194: 
        !           195: cnputc(c)
        !           196:        register int c;
        !           197: {
        !           198:        if (cn_tab == NULL)
        !           199:                return;
        !           200:        if (c) {
        !           201:                (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
        !           202:                if (c == '\n')
        !           203:                        (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
        !           204:        }
        !           205: }
        !           206: 
        !           207: pg(p,q,r,s,t,u,v,w,x,y,z) char *p; {
        !           208:        printf(p,q,r,s,t,u,v,w,x,y,z);
        !           209:        printf("\n>");
        !           210:        return(cngetc());
        !           211: }
        !           212: 
        !           213: 

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